Buggy code:
public final class IniSection implements Iterable { public IniSection ( ) { } public IniSection ( String name ) { } public IniSection ( IniSection config ) { } public void clear ( ) { } public void setName ( String name ) { } public String getName ( ) { } public int size ( ) { } public boolean isEmpty ( ) { } public Iterator iterator ( ) { } public List < String > getKeys ( ) { } public boolean containsKey ( String key ) { } public boolean containsValue ( String value ) { } public boolean containsValue ( String key , String value ) { } public boolean add ( String key , String value ) { } public Collection < String > getValues ( String key ) { } public int size ( String key ) { } public String get ( String key , int index ) { } public String get ( String key ) { } public String get ( String key , String defaultValue ) { } public boolean remove ( String key , String value ) { } public boolean remove ( String key ) { } public boolean replace ( String key , String value ) { } public void load ( InputStream is , String encoding ) throws IOException { } public void load ( InputStream is , String encoding , Filter < String > filter ) throws IOException { } public void load ( File file , String encoding ) throws IOException { } public void load ( File file , String encoding , Filter < String > filter ) throws IOException { } public void load ( byte [ ] buffer , String encoding ) throws IOException { } public void load ( byte [ ] buffer , String encoding , Filter < String > filter ) throws IOException { } public void save ( ) throws IOException { } public void save ( File file , String encoding ) throws IOException { } public void save ( Writer out ) { } public String report ( ) { } private String format ( final String value ) { } private Collection < String > getOrCreateValues ( final String key ) { } private void load ( Reader in , Filter < String > filter ) throws IOException { BufferedReader bin = null ; try { if ( in instanceof BufferedReader ) { bin = ( ( BufferedReader ) ( in ) ) ; } else { bin = new BufferedReader ( in , IniSection . MAX_BUFF_SIZE ) ; } while ( true ) { String line = advance ( bin ) ; if ( line == null ) { break ; } if ( isSectionLine ( line ) ) { name = line . substring ( 1 , ( ( line . length ( ) ) - 1 ) ) ; continue ; } int splitPos = getSplitPos ( line ) ; if ( splitPos < 0 ) { warnings . append ( "Skipping:<seq2seq4repair_space>Expected<seq2seq4repair_space>to<seq2seq4repair_space>see<seq2seq4repair_space>'='<seq2seq4repair_space>in:<seq2seq4repair_space>" ) . append ( line ) . append ( '\n' ) ; continue ; } String key = line . substring ( 0 , splitPos ) . trim ( ) ; String value = more ( bin , line . substring ( ( splitPos + 1 ) ) . trim ( ) ) ; <START_BUG> if ( ( filter != null ) && ( filter . test ( key ) ) ) { <END_BUG> add ( key , value ) ; } } report = warnings . toString ( ) ; warnings . setLength ( 0 ) ; warnings . trimToSize ( ) ; } finally { if ( bin != null ) { bin . close ( ) ; bin = null ; } } } private String advance ( BufferedReader bin ) throws IOException { } private boolean isCommentLine ( final String line ) { } private boolean isSectionLine ( final String line ) { } private int getSplitPos ( final String line ) { } private String more ( BufferedReader bin , String value ) throws IOException { } private static boolean more ( final String line ) { } private boolean allowed ( String key , String value ) { } private String name ; private Map < String , ListSet < String > > section ; private List < String > list ; private File configFile ; private String charset ; private StringBuilder warnings ; private String report ; private static final int MAX_BUFF_SIZE = 2 * 1024 ; }

Fix:
if ( ( filter == null ) || ( filter . test ( key ) ) ) {